The device can stretch 快見the back on the vertical plane a船這nd strengthen the muscle chain of 間放the active and antago熱白nistic muscles. On t話那he premise of ensu暗看ring the safety of patients, carry out 現花efficient training; The two-way h街國ydraulic resistance事紙 can start from th店件e lowest limit set, with smal唱跳l inertia, so as to avoid damage 錢靜to patients duri腦拿ng use; Comfortable use experience. Spe理服cial design is adopted for the str電拍essed parts of j拍務oints, which conform自小s to the principle of音就 human morphology.